Pivot-bearing for scale-beams.



No. 825,280. PATENTED JULY 3, 1906. A. H. SHOCK & W. L. KENDIG. PIVOT BEARING FOR SCALE BEAMS.

APPLIGATION FILED APR. 23, 1906.

IUNIT ED STATES PATENT @FFIQIE.

ABRAHAM H. SHOCK AND WILLIAh LL. KENDIG, OF LANCASTER,

PENNSYLVANIA, ASSIGNORS TO H. O. B. KENDIG, OF LANCAS- TER, P EN N SYLVANIA.

PIVOT-BEARING FOR SCALE-BEAMS.

Specification of Letters Patent.

Patented. July 3, 1906 Original application filed Tannary 31, 1906 Serial No. 298,842. Divided and this application filed April 23, 1906. Serial No. 313.188.

To all whom it puny concern.-

Be it known that we, ABRAHAM H. SI-IooK and IVILLIAM L. KENDIG, citizens of the nia, have invented certain new and useful Improvements m Pivot-Bearings for Scale- Beams; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to pivot-bearings for scale-beams; and it consists in the construction and combination of parts hereinafter more particularly set forth and claimed.

In the accompanying drawings, Figure 1 represents a side elevation of a scale-beam bearing and proximate part-s embodying our invention, the cap of the bearing being removed. Fig. 2 is a perspective View of our bearing-block and its cup. Fig. 3 is a plan view of the bearing-standard and the bearing-block. Fig. 4 is a side elevation of the bearing-block and cup. Fig. 5 is an enlarged perspective view of the cup. Fig. 6 is a similar view of the pivot-casing taken from behind, and Fig. 7 1s a perspective view of the cup inverted.

A designates the frame of a platform-scale B, the graduated tare-beam; C, the main poise hung to the outer end of said beam by a link C D, the auxiliary poise sliding on said graduated beam E, the scoop-poise; F, the rod, partly broken away, connecting the said beam to the weighing-levers under the de pressible platform (not shown) and hung from said beam by a link F; g, the feet of the graduated computing-panel, (not shown) fitting on the said raised parts 12 of said beam and detachably fastened thereto by screws 9, and H a standard rigid with the said frame, having the said beam pivotally mounted thereon. The said standard is bifurcated, as usual in such scales, to receive the middle part of said scale-beam, and each of the upright bearings H thus formed is provided with the ordinary recess h in its top to receive a bearing-block I, of agate or other hard material, which has a V-shaped bearing-groove I. In these grooves of the two bearing-blocks the knife-edged pivots of the scalebeam rest in the ordinary way.

It will often happen that such a knife-edge will not be precisely parallel to the axis of the pivot, but will slant downward outwardly or inwardly or be otherwise slightly uneven, especially afterlong use or repairs. The same may also be true of the bottom line of the V- shaped groove in some instances, though less often by reason of the greater hardness in the bearing-block. hen the knife-edge and the bottom line of the groove do not make a perfect fit, as in the above instances, the pivot under the weight of its beam and attachments will bear unequally on the block, tending to break it at one edge or the other. To prevent this, automatic means of compensation by self adjustment of the block have sometimes been employed by forming conical recesses in the bottom of the block, which fit loosely on fixed cones, the latter becoming pivots for the block; but this expedient obviously weakens the block and subjects it to an injurious wedge action at the weakest point, so that there is risk of splitting or fracturing it under the strain of weighing. This objection applies in greater or less degree to every compensating construction which in volves making a recess or recesses in the block. To secure the benefits of such compensation without thus weakening the block, we leave its bottom unrecessed and set it into a shell, cup, or casing L, of thin metal, the four side flanges of which are turned up against the sides of the block, covering the lower part of each of its faces, lugs Z being cut out from two of these flanges and turned down horizontally in the plane of the flat bottom of said cup or shell, from which the said lugs extend laterally in opposite directions. These lugs fit into vertical channels in the side walls of recess h, receiving the said block, the said channels extending from top to bottom of said recess and permitting the said lugs to be lifted up and out through them for freeing at will the said cup or shell and bearing-block, but preventing their accidental wear at all points. The metal shell L of course reinforces and protects the agate block instead. of weakening it. p

M designates an external casing for each pivot, fastened to the standard H by a screw m and having in its front an opening or win dow m, Fig. 6, behind which a plate of glass is interposed between said front of the casing and the bearing-block I. Since the pivot rests in the groove I of the said block, as shown in Fig. 1,'the end of said pivot is necessarily in contact with said glass plate. The two glass plates minimize friction at the ends of the pivots, while preventing any lateral movement of the tare-beam and attachments, and thus preventing the contact of said beam with either standard H. The pivot is not shown in Fig. 5, as it would hide a part of the bearing-block and shell and does not seem needed in said view.

The operation has already been sufficiently explained.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In a scale, the combination of a frame and tare-beam with bearing-blocks mounted for the pivots of said beam and metal shells inclosing the lower parts of said blocks, the said shells being adapted to rock and automatically adjust the blocks to the pivots, the bottoms of said blocks being unrecessed.

2. In a scale, the combination of a frame and tare-beam with a bearing-block for a pivot of the said beam, means for supporting said block and a casing for the lower part of said block having a transverse rib on its under side to permit therocking of said casing and block in adjusting the latter automatically to said pivot substantially as set forth.

3. In a scale, the combination of a frame and tare-beam with a bearing-block for a pivot of the said beam, means for supporting said block having vertical channels on each side thereofand a casing for the lower part of said block having projecting ears which are guided in the said channels substantially as set forth.

4. In a scale, the combination of a frame and tare-beam with bearing-blocks mounted for the pivots of said beam and metal shells inclosing the lower parts of said blocks, the 

